The team's been doing a good job. I'm on here a lot and only rarely do I run across spam. A lot of that is sneak-spam where the spammer posts what might be a legitimate post ("I'm really interested in <topic title here>, please send more info" or whatever), then sneaks a spam link into their signature.
I'm a mod on another forum and even with extra logon requirements, spammers still get in every now and then. Banning known spam ISPs in the far east helps, but also can block legitimate members.